Trolley.



No. 729,366. X PATENTED MAY 26, 1903.

' F. LBHRMANN.

TROLL-BY.

APPLICATION FILED APR. 2, 1903.

K0 MODEL.

UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

TRQLLEY,

- SPECIFICATION forming part of Leamratent noflaaeee, dated May 2c, 1903.

Application filecl April 2, 1903.

To all whom it may concern: 7

Be it kn own that I, FREDERICK'LEHRMANN, a citizen of the United States of America, residing at Turtlecreek, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Trolleys, of which the following is a speci fication, reference being had therein to the accompanying drawings. p

This invention relates to certain new and useful improvements in trolleys, the object of the invention being to provide means for normally holding the-trolley in-engagement with the wire and preventing the accidental displacement thereof by reason of the trolley.

rounding a curve or by reason of vibrationimparted to the trolley-pole. 1 Briefly described, my invention comprises", in connection with the trolley-harp, a pair of' side plates mounted on the axle or joi1rnalpin carried by the harp, these side plates being substantially triangular in section and. having journaled therein, near each of the upper corners, axles or journal-pins upon which are mounted trolley-wheels for engagement with the current-wire. These trolley-' wheels are mou'nted in tandem form, the first or frontwheel being of a considerably greater diameter than the rear wheeland the rear wheel being held up against the wire by means of a spring connected' to the frontofthe frame carrying the-wheels" and to the trolley-pole. Spring-pressed arms are pivoted to the triangular-shaped side plates and are turned inwardly at'their upper end toward each other, so as to lie normally over the current-wire and act as'guards. Means is connected to these guards whereby they 'are retracted to permit the removal of the trolleywheel from the wire or the placing of the same in position on the wire. H

In describing the invention in detail reference is had to the'accompanying drawings, forming a part of this specification, and wherein like numerals-of. reference indicate like parts throughout the several views, inwhich' I Figure 1 is a frontqelevation of myim'proved trolley, showing samein position on the trolley or current wire. Fig. 2 is a detail perspective View of one of the guard-arms. Fig.

Serial No. 150.774, (No model.)

'3 is'a side elevation of the trolley with the harp broken away.

. .To put my invention into practice, I pro- .vide a harp 1, which is suitably secured to the trolley-pole 2. Mounted in the prongs of this harp, near the upper end thereof, is an axle "or j ournal-pin 3, the ends of which extend beyond the sides of the prongs and have mounted thereon the substantially triangular-shaped side plates 4, held. in position on the axle or journal-pin by cotter-pins 5 or other suitable means. side platesf l, near each upper corner thereof,

- are the axles or journal-pins 6 7, respectively, which are held against longitudinal movement by cotter-pins 8 or other suitable means.

Mounted on these axles 6 and 7 are the trol- -ley-engagin g wheels 9 and 10, the former being of considerably greater diameter than the rear or trailer wheel, these two wheels being "mounted tandem or in alinement with each other. 011 the outer face of each of the side plates 4 is a pair of lugs 11, between "Twhich is pivotally mounted, by means of the pivot-pinil2, a pair of guard-arms 14, which extend upwardly above the upper edge of theside' plates and have their inner ends 1 5 extended inwardly toward each other a distance whereby to. leave a space between the arms less than the diameter of the current or trolley wire 16. Theseguard-arms are normally held in position (shown in Fig. 1) by means of springs 17, attached to the side plates and bearing against the inner face of the guard-arms 14 below the pivotal points of said arms. At their lower ends the said arms carry apertured lugs 18, to which are fastened the ends of the operating-cord 19. The side plates are braced bymeans'of cross-bars 20 and 21, the latter carrying the eyebolt 22, to which is attached the upper endof the spring 23, the lower end of said spring being connected to the clip 24, mounted on thetrolley-polel- When it is desired to place the trolley in position on the wire, apull' on the operating-cord 25 causes the ends 19 of said cord to pull the lower ends of the arms 1% toward each other, thus spreading the upper end of the arms, whereby the trolley may be readily engaged with the wire. The spring 23is made of such tension as to pull downwardly on the front Mounted in these.

ends of the plates 4, whereby to hold the trolley-wheel 10 in alinement with the trolleywheel 9 and in engagement with the trolleywire at the same time as the trolley-wheel 9 is engaging the wire. The additional protection of the two Wheels engaging the wire, in addition to the protection afforded by the guardarms, is therefore provided.

It will be observed that various changes may be made in the details of construction without departing from the general spirit of my invention.

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent, is-

In a trolley, the combination with a harp carrying an axle having its ends extending beyond the sides of the harp, of a pair of substantially triangular-shaped side plates mounted on the extended ends of said axle, a pair of axles j ournaled in said side plates near the 

